A predicted RNase toxin found in bacterial polymorphic toxin systems. The toxin possesses an all-beta fold and conserved ND and DxxR motifs and a histidine residue. In bacterial polymorphic toxin systems, the toxin is exported by the type 2 or TcdB/TcaC secretion system. Interestingly, the toxin is also found in type-II toxin-antitoxin systems [1].

1: Polymorphic toxin systems: comprehensive characterization of trafficking modes, processing, mechanisms of action, immunity and ecology using comparative genomics. Zhang D, de Souza RF, Anantharaman V, Iyer LM, Aravind L; Biol Direct. 2012;7:18. PMID:22731697